<dependency>
    <groupid>org.springframework.boot</groupid>
    spring-boot-starter-web</artifactid>
    <exclusions>
      <exclusion>
        <groupid>org.springframework.boot</groupid>
        spring-boot-starter-tomcat</artifactid>
      </exclusion>
    </exclusions>
    </dependency>
    <!--servlet依赖-->
  <dependency>
    <groupid>javax.servlet</groupid>
    javax.servlet-api</artifactid>
    <version>3.1.0</version>
    <scope>provided</scope>
  </dependency>
  <dependency>
    <groupid>org.apache.tomcat</groupid>
    tomcat-servlet-api</artifactid>
    <version>8.0.36</version>
    <scope>provided</scope>
  </dependency>

    @SpringBootApplication 
    public class DemoApplication extends SpringBootServletInitializer { 
    public static void main(String[] args) {
  SpringApplication.run(DemoApplication.class, args);
}
    @Override
    protected SpringApplicationBuilder configure
      (SpringApplicationBuilder builder) {
  return builder.sources(DemoApplication.class);
}
</code></code>
}

<context> 至<context xmlblockexternal="false">，就可以打包部署了
</context></context>